The data represented here comes form the U.S. Geological Survey National Land Cover Database, as downloaded through the Multi-Resolution Land Characteristics consortium, https://www.mrlc.gov/
Download urls:
The NLCD 2019 Tree Canopy has not yet been released, but is scheduled. The NLCD products have been updated every 2-3 years.
Variables include:
## Rows: 16
## Columns: 9
## $ GEOID <chr> "51001090200", "51001980200", "51001980100", "51001090400"…
## $ tree_can <dbl> 34.59905727, 3.47848680, 10.72295719, 19.42142210, 0.41467…
## $ imp_surf <dbl> 1.747226958, 2.505320597, 0.581228462, 1.415276737, 0.2338…
## $ tract <dbl> 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
## $ cells <dbl> 249275, 84483, 77479, 254989, 1235950, 542508, 251195, 211…
## $ developed <dbl> 20940, 6373, 1394, 15333, 873, 18434, 14559, 7713, 11250, …
## $ forest <dbl> 25508, 1094, 2725, 26307, 1, 17867, 33024, 4609, 15804, 0,…
## $ percent_dev <dbl> 8.400361e+00, 7.543529e+00, 1.799197e+00, 6.013201e+00, 7.…
## $ percent_for <dbl> 1.023288e+01, 1.294935e+00, 3.517082e+00, 1.031692e+01, 8.…
5-number summaries of variables by blocks:
##
## Summary Statistics
## ========================================
## Statistic Mean St. Dev. Min Median Max
## ----------------------------------------
## tree_can 15 21 0 3 91
## imp_surf 10 16 0 2 95
## percent_dev 33 40 0 11 100
## percent_for 5 12 0 0 100
## ----------------------------------------
Among the 11 land cover classifications, only 8 were present in the Charlottesville region. We summed the number of 30-meter cells within a spatial unit (census tract, census block group, census block) for the most frequent classifications:
Block level maps are slow to render and may be added later.
The percent of space in each 30-meter cell covered by impervious surfaces is estimated. The measures below take the average percent of impervious surface across all of the cells within a spatial unit (census tract, census block group, census block).
Block level maps are slow to render and may be added later.
The percent of space in each 30-meter cell covered by tree canopy is estimated. The measures below take the average percent of tree canopy across all of the cells within a spatial unit (census tract, census block group, census block).
Block level maps are slow to render and may be added later.